Windows 7: back up individual programs?

Hi, how do i back up just a program and not a full system image or clone or back up everything at once? i want to back up iTunes at certain times when i have loaded say, 10 cd's into it. should i create an folder of iTunes on my external HDD or (on my internal hard drive), just save it into that folder every time as time goes by? i don't understand how the system works. i'm confused. is there a program that can help with? thank you

You can not backup programs.

The different components used to install programs are spread across lots of different system directories, including information embedded in the Registry (which is itself, a collection of files).

can i back up albums & songs in iTunes?

How to back up your media in iTunes

Mark is right when it pertains to installed applications. Some portable applications, or those that are merely unzipped and keep data in the AppData folder can be totally backed up by copying a couple of folders. One example is Chromium browser snap shot. Not the mini installer but the win 32 zip.

Also I write a bunch of little hotkey tray utilities. Nearly all can be backed up just by copying the containing folder you unzipped into.

But it if uses the Registry, dlls etc.. you're better off imaging your system partition and any with installed programs.